问题 单项选择题

具有良好的塑性、韧性、冷弯性能、冷热压力加工性能和焊接性能,适用于制造各种容器、焊管、建筑结构等的低合金钢为()。

A.Q255

B.Q275

C.Q295

D.Q345

答案

参考答案:C

解析:

低合金高强度结构钢中,Q295(09MnV、09MnNb)具有良好的塑性、韧性、冷弯性能、冷热压力加工性能和焊接性能,且有一定的耐蚀性能。适用于制造各种容器、螺旋焊管、建筑结构、车辆用冲压件和船体等。

阅读理解

M r . Dawson was an old man with a bad temper(脾气) . And everyone in town knew it. Kids were afraid to go into his yard to pick apples .

One Friday , 12-year-old Janet and her friend Amy had to walk past M r . Dawson ' s house . When Janet saw him ,she suggested crossing the street to the other side . But Amy said they needn' t .                                                                                                       

When M r . Dawson saw Amy ,he smiled and said , “ hello , Amy ! I see you have a new friend with you today .” Amy smiled back and told him that Janet would stay with her that night . M r . Dawson looked friendly and gave them each a fresh apple . The girls were glad to get them .

Later Janet asked Amy , “ everyone says he is the most unwelcome person in town . Why was he so kind to us ? ” Amy explained that when she first walked past his house , she was also afraid of him . But she pretended there was an invisible ( 看不见的)smile on his face and then started talking to her . Just a “ hello ” at first , and then more .

“ An invisible smile ?”Janet was puzzled ,“ Yes ,” answered Amy , “ My grandma told me to think so . She says smiles can run around . If we keep smiling at someone , sooner or later he will really smile back . ” 

Remember what Amy ' s grandma said ,and we will find that most people can ' t refuse our smile .

小题1:What did people feel about M r . Dawson ?

小题2:What did Janet think of M r . Dawson after getting an apple from him ?

小题3:What did Amy do when she first walked past M r . Dawson ' s house ?

小题4:Who did Amy learn “ an invisible smile ” from ?

小题5:What does the writer advise us to do ?

选择题